it was a stunning resignation of david petraeus, a general, catching lawmakers by surprise, the a congress gets sets for hearings into the deadly terror attack on the u.s. consulate in libya. on "fox news sunday" an interview with the chair of the senate intelligence committee, diane feinstein who oversees the nation's intelligence agencies. >> it's a heartbreak. i'm very -- this is a truly bright man, a credible person, a great leader, and could have really been a super transitional figure for the c.i.a. this is very, very hard.